Refillable fuse



D. W. YAMBERT REFILLA BLE FUSE Filed Nov, 19. 1919 Vlg. E

FL .1D

Patented Oct. 6, 1925.

UNITED STATESv PATENT FFICE.

DALE W. YAMBERT, 0F TOLEDO, O'HIO.

BEFILLABLE FUSE.

Application led November 19, 1919. Serial No. 339,150.

To all lwhom t may concern.'

Be it known that I, DALE 1V. YAMBERT, a citizen of the United States of America, residing at Toledo, Lucas Count-y, Ohio, have invented new and useful Refillable Fuses, of which the following is a specification.

This invention relates to that type of interrupting devices for electrical circuits involving the replacementof a fusible element or link. 1

This invention has utility when incorporated in enclosed refillable fuses.

Referring to the drawings:

Fig. 1 is a perspective view of a ferrule ty e cylindrical fuse; v

ig. 2 is a perspective view of one of the portions of the fuse of Fig. l;

Fig. 3 is a perspective view of the member coacting with the seat in the portion or section of Fig. 2;

Fig. 4 is a fragmentary longitudinal section ofthe device of Fig. 1, with one of the enclosing portions but partly assembled;

Fi 5 is a view at right angles to the showing of Fig. 4; A

Fig. 6 is a view of the blank for the link;

Fig. 7 is a perspective view of the link;

Fig. 8 is a view of a knife blade type of fuse;

Fig. 9 is a perspective view of one of the seat or contact elements of the fuse of Fig. 8; Fig. 10 is a view of the element of Fig. 9 with an additional assemblying feature therewith;

Fig. 11 is a perspective view of one of the entlosing elements of the device of Fig. 8; an

y Fig. 12 is a section of the end of the fuse of Fig. ,8.

As a housing for this fuse structure, there is provided 4herein acylindrcal tubular shell 1 which may be of insulating material, as fiber, which shell near each end has an inner shoulder 2. Anchored to each end of this shell by rivets 3 is a member 4 having on its exterior terminus a threaded portion 5 and therein a pair of opposing wedge seats 6. In the device of Fig. 4 these wedge seats 6 are opposed by a wedge member 7 having a projection 8 which may be riveted to have swivel connection with an outer cap or ferrule member 9.

' These members 7 and 9 thus form a unit, the member 9 being operative for threaded engagementwith the threads 5 to force the relative-ly non-rotatable member 7 towards the seats 6.

The element for electrical circuit interruption is herein shown as a strap or fusible' link comprising two similar longitudinally extending sections 10 normally connected by bent portions 11 and otherwise separate so that in folding over from the showing in Fig. 6 to the showing in Fig. 7, tongues 12, 13, may anchor the two strips 10 into parallel relation, the broadened intermediate portions 15 being insulated from one another with a coating of varnish 14. Accordingly, there is provided in this element for electrical circuit interruption or fusible link the broadened intermediate portions 15 insulated from each other by the insulation 14. These broadened intermediate portions 15 having connection by narrowed portions or necks 16 with the broadened terminal portions 17. These flattened terminals 17 may be opened out against the contact seats 6 and engaged by wedge 7 for a distributed or large contact surface in anchoring with the member 4 by the wedge 7 screwed thereagainst by the member 9. This means a most positive and rm gripping or anchoring of the terminal or end portions of the fusible link.

In operation, of course when the amperage becomes excessive, the heating will be greatest at the neck portions 16 and when these approach a fused or molten condition, there is rupture at these weakened necks 16.

There may be ready replacement of links without the use of any tools for all that it is necessary to do is to operate the threaded member 9 to remove the member 7, swivelled thereto, out of the member 4. Of course the withdrawal of the member 7 from the member 4 is by direct action, while the turning action of the member 9 coacting with the thread 5 effects a positive drawing-out. A-

link having interrupted the electrical circuit, it may be readily replaced by a new link or element.

Another feature of considerable importance is the provision of an indicator or vernier' mark 18 on the member 9 to coact with the indication or ampere reading 19 on the enclosing or shell member 1. This provides al means for externally identifying just exactly what may be the ampere capacity of the links used in the shell 1. But a single link may be placed in the shell at any one time, for should the terminals of two i.:

links be against the contact seats 6 the wedge 7 could not enter the proper distance and the assembled fuse would'be of abnormal length. The link has its capacity Vdetermined by its thicknessand sunhtrminal thicknesses may be made standard for different amperage ratings. Accordingly,` since different thicknesses of links will permit member 9 to be threaded onto the-member 4 to a greater or less degree, a definiteand positive-indication ofthe ampere capacity of the link within .will be made by the indicater mark 18 pointingto, the ampere readin 19.

n adapting the device of this disclosure from the ferrule type of fuse of Fig. 1 to the knife "blade t of fuse of Fig. 8, the wedge 7"1s provide with a recess 20 in which may be,we1d.ed or positively'anchored a slotted member 21,0ver which a washer 22 may be slipped and welded or .positively .anchored to wedge 71. Knife blade 23 may be inserted inthe slot of member 21 and weldedor othertvisef pslitively anchored in place. When so 'assem ed as a unit of the device,Y the knife. blade 23. may be'thrust. throu h the endof the member'A 9 as permitted y the win 24 (Fig` ll). When this assembly is ecte these1 wings 24 may vbe pressed down linto the plane ofthe end of the member 9,' andthe assembly for operation as wellv as for re la'ementof links occurs as with the' ferru e type of fuse. Any fumes orgases' fromI lblovvin of the fuse or link are sea in the enclose device for the member 9* is snugl ragainst the swivel head 8 or the washer 2 is.abutting the member 9 to seal thev opening about the closed wings 24.

The apparatusis offew parts, simple in construction., andmav be manipulated at all; times by the, hands of lthe operator. It has exceptionally lar e link contacts reducing the tendencyto eatduring operation. TtA .possesses the `feature, v of` indicating from without the .Capacityofl the link within. Itcannot be assembled' with more than one .link Within,V which;v arantees that it cannot over-fused. 'i t iS Substantial in construction, conforming to rigid requirements ot safety, aswell as possessing great advantasH/for the operator. ,4

. at is claimed and it. is desired toasecure by LettersPatent is:

l. A fuse having an enclosure, an element for electrical circuit interruption I in said enclosure, and anchoring. means having a scale'disclosing indication in coaction with Athe enclosureisaid means bein'gtfor thev purrpose of disclosingfsthe identity of the element for fuse operatitm.v

jfuse' structure embodying e ribbon etement for electric-.circuit interruption, and. clamp mounting for the. element embedylng a'. hushnigi havin a way.y therethrough providing inway facing seat Aing `seat-,fen sagging the op in a plane against which a terminal of the ribbon element may rest, a (plugfbli ultering said bushing and ed with "a seat in a plane parallel to e plane of the bush- 'te side of the element as against the bu 'ng seat, and moans having swivel connection with the plug for effecting relative travel between theV plug and'` bushing at an angle to the plane of the seats for effecting clamping of the element therebetween.

'3. 'A fuse structure embodying` a ribbon element for electric circuit' interruption, an

insulation shell and clamp mountinimeansg for the element in said shell bushing' having a waytherethrbitgh prmd-i ing an inwardly facing seat in aplane against whicha terminal ofthe ribbon` element may rest, a plug'for entering said bushing. and ,provided with a seat ina plane u parallel to the plane of .the .bushing sea-t for engaging the opposite side of the elementas against the bushing wat, and means having swivel connection with the ping. for efecting `relative travel between the plug -al'ld bushing at an angle to the` plane of the seats for effecting clamping of the 'element therebetween. i' A A v 4. A fiise structure embodying-ia ribbon elementor electric circuit ,interruptionwan insulation shell, andelaupp mountiagmeans for. 'the element. in .said shell. ,a bushing yhaving a. way therethrough'provding an inwardly facing ,seah in fa plane against. which a. pf the ribbonE `ole ment may rest, Aa p ug. or entering' sai bushingend .pleaded with sea in. man@ parallel to the plane of the bushing seat for engaging the oppositesidecf the yelement as .theibilshngw y threaded means at one end, of .the shellfnnd a threaded actuator rotatably coacting ,with said threaded means and havingswinelwnnection with the plug for shifting Atheplug.

plugs, one. forP entering each offsaidfbush ings., each plug being vprovided withia seat ina plane parallel .toA the opposin Y.bushing seat for engaging. the 'tesi e of the element, the extension the planes of the seatsatf oneend of. the shell intersecting. in

the-'shell theextensionoftlplaneszof the .t

seats at thenther end ofthe, 1and :means having swivel connection with the pluggingetfecting. relative .travel between. each, @lug and bushingidependentlyf of. relativeL n tation therebetween. .y

'6'. A st'uctnre embodying a iblion htherebelngz"K iin element for electric circuit interruption, an insulation shell, and clamp mountin means for the element in said shell em yin bushings, one fixed in each end of the shel each bushing having a way therethrough providing a seat in a plane against which a terminal of the ribbon element may rest, plugs, one for entering each of said buslings, each plug being provided with a seat in a plane parallel to the opposing bushing seat for engagin the opposite side of the element, there being threaded means at each end of the shell, and a threaded actuator rotatably coacting with each of the threaded means and having swivel connection with the plugs for shifting a plu 7. A housing for a fuse e ement for electric current interruption, said housing embodying a 61st member, a second member movable relatively thereto into a plurality of clamping positions for a fuse element therebetween, there being means for indicating the positions of the clamping of the element for disclosing the relative spacing between the members whereby there is disclosed exterior of this housing the current carrying capacity of the fuse element as mounted therein.

8. A housing for a fuse element for electric current interruption, said housing embodying a first member, a second member movable relatively thereto into ay plurality of clamping positions for a fuse element therebetween, and means having swivel connection with the second member and rotatable as to the members and elementi In witness whereof I affix my signature.

DALE W. YAMBERT. 

